Miter gauge



Jan. 16, 1923.

amawtoz James Wilt-511 119.

J. W. GRANDLE.

MITER GAUGE.

FILED JAN. 21. 1922.

Vlill E2225 all r Patented Jan. 16, 1923.

UNITED IjsTATes,

P T ,FFICE,

JAMES w. GRANDLELOF PIERRE, sou'rn DAKOTA.

MITER GAUGE.

Application filed. January 21, 1922. .Serial No. 530,923.

of which the following is a specification,

reference being had to the accompanying drawings.

This invention relates to saw gauges and vision of a gauge which may beemployed for the formation of miter cuts or may be used for gauging atool in gaining operationssuch as forming gains for shelving and thelike. v y

A further object of the invention is to provide a device of thischaracter which is extremely simple in construction and operation andwhich may be very cheaply constructed.

A still further object of the invention is to provide a neat and compacttool which may replace the ordinary miter box in making miter cuts andwhich may be much more readily employed.

Other objects and advantages of the in-. vention will become apparentthroughout the course of the following description.

In the accompanying drawings wherein for the purpose ofv illustration'is shown a preferred embodiment of my invention, and wherein likereference characters designate like. part-s throughout; I

Figure 1 is a perspective view of a gauge constructed in accordance withmy invention 5 Figure 2 is a section on the line- 2.2

of Figure 1 I the cut is to be made; is made entirely plain with theexception of openings 13 formed therein, through which securing elementsmay be driven into the member to be cut to maintain the device inposition. If desired, the inner face of the'plate 11 may% I have formedthereon piercing points 13" for this purpose and the openings 13 may bedispensed with or both means may be em ployed.

The plate 12 has'formed therein alongi- .tudinally extending slot 14,the under sides 'of which willb'e under cut to 'formupon the undersurface of the plate 12 rebated .ShOl'llClGIS 15 having their facesmilled. has for an important object thereof thepro Slidably mountedwithin the slot 1 1- is a runner 16 having=at its sides flanges 17operating beneath the shoulders 15 and having, their upper surfacesmilled. The upper surface. of the runner 16 issubstan- 'tially flushwith the upper surface of the plate '12 and has secured thereto byvmeans of a screw 18 extending into the runner a plate 19.whichembodiesportions overlying the edges of the slot 14. The plate 19 isbolt 18 asat 20 to the runner so as toprevent shifting of the platerelative to the likewise secured at a point remote from the r runner.This plate embodies a pointer finger v 21 coactingwith graduations 22formed The clamping head 18- likewise serves to clamp one endfof an arm23 I which surrounds the bolt 18 and is rotatable thereonf The plate 12is provided at one end thereof with an enlargement 12 having upstancting therefrom a pivot post 2 1.

The opposite 'end of the arm 23 is pivotally connected with a guideclamp C for guiding the saw in making the cut. This clamp consists of apair of substantially similarsections 25 having fiat adj acentfaces 26'which I are smoothly finished and which are adapted to engage theopposite sides of" a saw blade disposed therebetween. The faces :26 areheld 'in engagement with the saw blade interposed between by means ofspring U-bolts 27 preferably two in number and disposed adjacent theends'of the sections 25. One of the sections 25 embodies an extension 28disposed at the side thereof remote from-its plain face 26 and thisextension is rotatably engaged with the post 7 24 of the plate 12, theextension being held in position thereon by means of a nut 29. This nutdoes not bind the extension 28,

since it engages against the shoulder 30 formed on the post 24. One ofthe U-bolts 27 preferably extends entirely through the sections 25 andis provided upon one leg thereof with an extension 31 having its lowerend arranged in the same plane as the under surface of the plate 12. Theother leg of the U-bolt preferably forms the pivotal mounting of thearm"28up'on the clamp. The inneredge of the plate 12 or that edgethereof most remote from the plate 11 is provided therein with a seriesof notches 32 and 32*. The notches 32 are arranged at a predetermineddistance from one another, preferably approximately two inches and aredesignated by numerals to indicate the distance from the plate of a sawplaced in the guide clamp C when the guide clamp is arranged at rightangles to the main frame 10.

A notch 32 is arranged intermediate each of the notches 32 and is spacedtherefrom a predetermined space, for example, threequarters of an inchwhich is equivalent to the thickness of a finished one-inch board suchas employed in shelving. When it is desired to employ the device formiter cuts the face 11 is placed against the surface of the material tobe out next adjacent that surface thereof where the miter cut is to bemade and secured in position in any desired manner. A gauge may be thenset to direct the clamp at the selected angle by loosening the thumbscrew 18 and shifting the pointer 21 of the plate 19 until it coincideswith the graduations of the cut desired, the graduations 22 being markedin degrees, as 45", 90, etc. The 90 graduation is preferably arrangedsubstantially centrally of the slot 14 as regards its length so thatmiter cuts may be made to either side of the center. The saw is thenplaced in position in the clamp and operated. to form the out.

When it is desired to employ the clamp for gaining, as in forming astandard for shelving, a nail is driven into the material and the lastright hand notch of the plate 12 engaged therewith. The cut is formedand the gauge is operated until the next notch engages the nail when thesecond cut for the gain is made. These cuts may then be employed asguides in making succeeding cuts and the cuts may be spaced apart thedesired distance by simply coinciding the notch at the desiredmeasurement with. the preceeding cut. Thus the gains may be spaced aparta distance of four notches, six, eight, or any other desired measurementwithin the scope of the instrument which may, of course, be made in anydesired length.

From the foregoing, it is believed to be obvious that I have constructedan instrument for the purposes intended which is particularly welladapted for the use set forth in that it eliminates the necessity ofproviding separate instruments to perform the operations described, andin that it eliminates the necessity of employing miter boxes which arecumbersome and which after much usage become very inaccurate. It willfurthermore be obvious that many changes are possible in the shape, sizeand arrangement of the parts herein described without in any mannerdeparting from the spirit of my invention, or the scope of the subjoinedclaims.

WVhat is claimed is 1. A device of the character described comprisingan'angle frame having formed in one plate thereof a longitudinallyextending slot, a runner slidably mounted within the slot, a saw guidepivotally connected to said frame at one .end thereof, anarm connectingthe free end of the saw guide with said runner and vpivotally connectedwith each thereof, and means for simultaneously clamping the arm to therunner and the run ner in adjusted position.

2. A gauge of the type described embodying a -ma-in frame comprisingapair of rectangular-1y disposed plates one of which is provided with alongitudinally extending slot, a runner slidably mounted in said slotandprovided with a pointer coac-ting with the graduati'ons formed upon theplate, means for locking-the runner in adjusted position, a clamp guidepivotally, mounted. upon the upper face of the slotted plate at one endthereof and embodying jaw sections, spring U-bolts connecting said jawsections and tending to force the same togethenan' arm pivotallyconnected to said runner at one endand with an arm of one of the U-bolts at the opposite end, and an extension carried by-one of said jawsections and having its lower face coplanar with the lower face of saidplate.

In testimony whereof I hereunto afiix my JAMES W. GRANDLE.

signature.

